server-side browser detection? node.js


Question

Most implementations i've seen are for browser detection on the client side. I was just wondering if it was possible to do browser detection before sending any resources to the client.

Thanks.

1
58
5/28/2011 5:47:06 PM

Accepted Answer

var ua = request.headers['user-agent'],
    $ = {};

if (/mobile/i.test(ua))
    $.Mobile = true;

if (/like Mac OS X/.test(ua)) {
    $.iOS = /CPU( iPhone)? OS ([0-9\._]+) like Mac OS X/.exec(ua)[2].replace(/_/g, '.');
    $.iPhone = /iPhone/.test(ua);
    $.iPad = /iPad/.test(ua);
}

if (/Android/.test(ua))
    $.Android = /Android ([0-9\.]+)[\);]/.exec(ua)[1];

if (/webOS\//.test(ua))
    $.webOS = /webOS\/([0-9\.]+)[\);]/.exec(ua)[1];

if (/(Intel|PPC) Mac OS X/.test(ua))
    $.Mac = /(Intel|PPC) Mac OS X ?([0-9\._]*)[\)\;]/.exec(ua)[2].replace(/_/g, '.') || true;

if (/Windows NT/.test(ua))
    $.Windows = /Windows NT ([0-9\._]+)[\);]/.exec(ua)[1];

That should work for you. Just put it in your response handler.

81
5/28/2011 6:53:10 PM

The ua-parser library for node (npm install ua-parser) exposes a big set of regexes for browser user-agent strings. I'd strongly recommend it for your needs.


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